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<div id="overview"><a href="../../../../../../api/org/jboss/netty/handler/execution/FairOrderedMemoryAwareThreadPoolExecutor.html">View Javadoc</a></div><pre>

<a class="jxr_linenumber" name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="2" href="#2">2</a>   <em class="jxr_comment"> * Copyright 2015 The Netty Project</em>
<a class="jxr_linenumber" name="3" href="#3">3</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="4" href="#4">4</a>   <em class="jxr_comment"> * The Netty Project licenses this file to you under the Apache License, version 2.0 (the</em>
<a class="jxr_linenumber" name="5" href="#5">5</a>   <em class="jxr_comment"> * "License"); you may not use this file except in compliance with the License. You may obtain a</em>
<a class="jxr_linenumber" name="6" href="#6">6</a>   <em class="jxr_comment"> * copy of the License at:</em>
<a class="jxr_linenumber" name="7" href="#7">7</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="8" href="#8">8</a>   <em class="jxr_comment"> * <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a class="jxr_linenumber" name="9" href="#9">9</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="10" href="#10">10</a>  <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software distributed under the License</em>
<a class="jxr_linenumber" name="11" href="#11">11</a>  <em class="jxr_comment"> * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express</em>
<a class="jxr_linenumber" name="12" href="#12">12</a>  <em class="jxr_comment"> * or implied. See the License for the specific language governing permissions and limitations under</em>
<a class="jxr_linenumber" name="13" href="#13">13</a>  <em class="jxr_comment"> * the License.</em>
<a class="jxr_linenumber" name="14" href="#14">14</a>  <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="15" href="#15">15</a>  <strong class="jxr_keyword">package</strong> org.jboss.netty.handler.execution;
<a class="jxr_linenumber" name="16" href="#16">16</a>  
<a class="jxr_linenumber" name="17" href="#17">17</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.channel.ChannelEvent;
<a class="jxr_linenumber" name="18" href="#18">18</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.channel.ChannelState;
<a class="jxr_linenumber" name="19" href="#19">19</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.channel.ChannelStateEvent;
<a class="jxr_linenumber" name="20" href="#20">20</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.util.ObjectSizeEstimator;
<a class="jxr_linenumber" name="21" href="#21">21</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.util.internal.ConcurrentIdentityWeakKeyHashMap;
<a class="jxr_linenumber" name="22" href="#22">22</a>  
<a class="jxr_linenumber" name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.ConcurrentMap;
<a class="jxr_linenumber" name="24" href="#24">24</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.ThreadFactory;
<a class="jxr_linenumber" name="25" href="#25">25</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.TimeUnit;
<a class="jxr_linenumber" name="26" href="#26">26</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
<a class="jxr_linenumber" name="27" href="#27">27</a>  
<a class="jxr_linenumber" name="28" href="#28">28</a>  <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="29" href="#29">29</a>  <em class="jxr_javadoccomment"> * This is a &lt;b&gt;fair&lt;/b&gt; alternative of {@link OrderedMemoryAwareThreadPoolExecutor} .</em>
<a class="jxr_linenumber" name="30" href="#30">30</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="31" href="#31">31</a>  <em class="jxr_javadoccomment"> * &lt;h3&gt;Unfair of {@link OrderedMemoryAwareThreadPoolExecutor}&lt;/h3&gt;</em>
<a class="jxr_linenumber" name="32" href="#32">32</a>  <em class="jxr_javadoccomment"> * The task executed in {@link OrderedMemoryAwareThreadPoolExecutor} is unfair in some situations.</em>
<a class="jxr_linenumber" name="33" href="#33">33</a>  <em class="jxr_javadoccomment"> * For example, let's say there is only one executor thread that handle the events from the two channels, and events</em>
<a class="jxr_linenumber" name="34" href="#34">34</a>  <em class="jxr_javadoccomment"> * are submitted in sequence:</em>
<a class="jxr_linenumber" name="35" href="#35">35</a>  <em class="jxr_javadoccomment"> * &lt;pre&gt;</em>
<a class="jxr_linenumber" name="36" href="#36">36</a>  <em class="jxr_javadoccomment"> *           Channel A (Event A1) , Channel B (Event B), Channel A (Event A2) , ... , Channel A (Event An)</em>
<a class="jxr_linenumber" name="37" href="#37">37</a>  <em class="jxr_javadoccomment"> * &lt;/pre&gt;</em>
<a class="jxr_linenumber" name="38" href="#38">38</a>  <em class="jxr_javadoccomment"> * Then the events maybe executed in this unfair order:</em>
<a class="jxr_linenumber" name="39" href="#39">39</a>  <em class="jxr_javadoccomment"> * &lt;pre&gt;</em>
<a class="jxr_linenumber" name="40" href="#40">40</a>  <em class="jxr_javadoccomment"> *          ----------------------------------------&amp;gt; Timeline --------------------------------&amp;gt;</em>
<a class="jxr_linenumber" name="41" href="#41">41</a>  <em class="jxr_javadoccomment"> *           Channel A (Event A1) , Channel A (Event A2) , ... , Channel A (Event An), Channel B (Event B)</em>
<a class="jxr_linenumber" name="42" href="#42">42</a>  <em class="jxr_javadoccomment"> * &lt;/pre&gt;</em>
<a class="jxr_linenumber" name="43" href="#43">43</a>  <em class="jxr_javadoccomment"> * As we see above, Channel B (Event B) maybe executed unfairly late.</em>
<a class="jxr_linenumber" name="44" href="#44">44</a>  <em class="jxr_javadoccomment"> * Even more, if there are too much events come in Channel A, and one-by-one closely, then Channel B (Event B) would be</em>
<a class="jxr_linenumber" name="45" href="#45">45</a>  <em class="jxr_javadoccomment"> * waiting for a long while and become "hungry".</em>
<a class="jxr_linenumber" name="46" href="#46">46</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="47" href="#47">47</a>  <em class="jxr_javadoccomment"> * &lt;h3&gt;Fair of FairOrderedMemoryAwareThreadPoolExecutor&lt;/h3&gt;</em>
<a class="jxr_linenumber" name="48" href="#48">48</a>  <em class="jxr_javadoccomment"> * In the same case above ( one executor thread and two channels ) , this implement will guarantee execution order as:</em>
<a class="jxr_linenumber" name="49" href="#49">49</a>  <em class="jxr_javadoccomment"> * &lt;pre&gt;</em>
<a class="jxr_linenumber" name="50" href="#50">50</a>  <em class="jxr_javadoccomment"> *          ----------------------------------------&amp;gt; Timeline --------------------------------&amp;gt;</em>
<a class="jxr_linenumber" name="51" href="#51">51</a>  <em class="jxr_javadoccomment"> *           Channel A (Event A1) , Channel B (Event B), Channel A (Event A2) , ... , Channel A (Event An),</em>
<a class="jxr_linenumber" name="52" href="#52">52</a>  <em class="jxr_javadoccomment"> * &lt;/pre&gt;</em>
<a class="jxr_linenumber" name="53" href="#53">53</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="54" href="#54">54</a>  <em class="jxr_javadoccomment"> * &lt;b&gt;NOTE&lt;/b&gt;: For convenience the case above use &lt;b&gt;one single executor thread&lt;/b&gt;, but the fair mechanism is suitable</em>
<a class="jxr_linenumber" name="55" href="#55">55</a>  <em class="jxr_javadoccomment"> * for &lt;b&gt;multiple executor threads&lt;/b&gt; situations.</em>
<a class="jxr_linenumber" name="56" href="#56">56</a>  <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="57" href="#57">57</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/jboss/netty/handler/execution/FairOrderedMemoryAwareThreadPoolExecutor.html">FairOrderedMemoryAwareThreadPoolExecutor</a> <strong class="jxr_keyword">extends</strong> <a href="../../../../../org/jboss/netty/handler/execution/MemoryAwareThreadPoolExecutor.html">MemoryAwareThreadPoolExecutor</a> {
<a class="jxr_linenumber" name="58" href="#58">58</a>  
<a class="jxr_linenumber" name="59" href="#59">59</a>      <em class="jxr_comment">// end sign</em>
<a class="jxr_linenumber" name="60" href="#60">60</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../../org/jboss/netty/handler/execution/FairOrderedMemoryAwareThreadPoolExecutor.html">EventTask</a> end = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/jboss/netty/handler/execution/FairOrderedMemoryAwareThreadPoolExecutor.html">EventTask</a>(<strong class="jxr_keyword">null</strong>);
<a class="jxr_linenumber" name="61" href="#61">61</a>  
<a class="jxr_linenumber" name="62" href="#62">62</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> AtomicReferenceFieldUpdater&lt;EventTask, EventTask&gt; fieldUpdater =
<a class="jxr_linenumber" name="63" href="#63">63</a>              AtomicReferenceFieldUpdater.newUpdater(EventTask.<strong class="jxr_keyword">class</strong>, EventTask.<strong class="jxr_keyword">class</strong>, <span class="jxr_string">"next"</span>);
<a class="jxr_linenumber" name="64" href="#64">64</a>  
<a class="jxr_linenumber" name="65" href="#65">65</a>      <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">final</strong> ConcurrentMap&lt;Object, EventTask&gt; map = newMap();
<a class="jxr_linenumber" name="66" href="#66">66</a>  
<a class="jxr_linenumber" name="67" href="#67">67</a>      <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="68" href="#68">68</a>  <em class="jxr_javadoccomment">     * Creates a new instance.</em>
<a class="jxr_linenumber" name="69" href="#69">69</a>  <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="70" href="#70">70</a>  <em class="jxr_javadoccomment">     * @param corePoolSize the maximum number of active threads</em>
<a class="jxr_linenumber" name="71" href="#71">71</a>  <em class="jxr_javadoccomment">     * @param maxChannelMemorySize the maximum total size of the queued events per channel. Specify {@code 0} to</em>
<a class="jxr_linenumber" name="72" href="#72">72</a>  <em class="jxr_javadoccomment">     * disable.</em>
<a class="jxr_linenumber" name="73" href="#73">73</a>  <em class="jxr_javadoccomment">     * @param maxTotalMemorySize the maximum total size of the queued events for this pool Specify {@code 0} to</em>
<a class="jxr_linenumber" name="74" href="#74">74</a>  <em class="jxr_javadoccomment">     * disable.</em>
<a class="jxr_linenumber" name="75" href="#75">75</a>  <em class="jxr_javadoccomment">     * @noinspection unused</em>
<a class="jxr_linenumber" name="76" href="#76">76</a>  <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="77" href="#77">77</a>      <strong class="jxr_keyword">public</strong> <a href="../../../../../org/jboss/netty/handler/execution/FairOrderedMemoryAwareThreadPoolExecutor.html">FairOrderedMemoryAwareThreadPoolExecutor</a>(<strong class="jxr_keyword">int</strong> corePoolSize, <strong class="jxr_keyword">long</strong> maxChannelMemorySize,
<a class="jxr_linenumber" name="78" href="#78">78</a>                                                      <strong class="jxr_keyword">long</strong> maxTotalMemorySize) {
<a class="jxr_linenumber" name="79" href="#79">79</a>          <strong class="jxr_keyword">super</strong>(corePoolSize, maxChannelMemorySize, maxTotalMemorySize);
<a class="jxr_linenumber" name="80" href="#80">80</a>      }
<a class="jxr_linenumber" name="81" href="#81">81</a>  
<a class="jxr_linenumber" name="82" href="#82">82</a>      <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="83" href="#83">83</a>  <em class="jxr_javadoccomment">     * Creates a new instance.</em>
<a class="jxr_linenumber" name="84" href="#84">84</a>  <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="85" href="#85">85</a>  <em class="jxr_javadoccomment">     * @param corePoolSize the maximum number of active threads</em>
<a class="jxr_linenumber" name="86" href="#86">86</a>  <em class="jxr_javadoccomment">     * @param maxChannelMemorySize the maximum total size of the queued events per channel. Specify {@code 0} to</em>
<a class="jxr_linenumber" name="87" href="#87">87</a>  <em class="jxr_javadoccomment">     * disable.</em>
<a class="jxr_linenumber" name="88" href="#88">88</a>  <em class="jxr_javadoccomment">     * @param maxTotalMemorySize the maximum total size of the queued events for this pool Specify {@code 0} to</em>
<a class="jxr_linenumber" name="89" href="#89">89</a>  <em class="jxr_javadoccomment">     * disable.</em>
<a class="jxr_linenumber" name="90" href="#90">90</a>  <em class="jxr_javadoccomment">     * @param keepAliveTime the amount of time for an inactive thread to shut itself down</em>
<a class="jxr_linenumber" name="91" href="#91">91</a>  <em class="jxr_javadoccomment">     * @param unit the {@link TimeUnit} of {@code keepAliveTime}</em>
<a class="jxr_linenumber" name="92" href="#92">92</a>  <em class="jxr_javadoccomment">     * @noinspection unused</em>
<a class="jxr_linenumber" name="93" href="#93">93</a>  <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="94" href="#94">94</a>      <strong class="jxr_keyword">public</strong> <a href="../../../../../org/jboss/netty/handler/execution/FairOrderedMemoryAwareThreadPoolExecutor.html">FairOrderedMemoryAwareThreadPoolExecutor</a>(<strong class="jxr_keyword">int</strong> corePoolSize, <strong class="jxr_keyword">long</strong> maxChannelMemorySize,
<a class="jxr_linenumber" name="95" href="#95">95</a>                                                      <strong class="jxr_keyword">long</strong> maxTotalMemorySize, <strong class="jxr_keyword">long</strong> keepAliveTime, TimeUnit unit) {
<a class="jxr_linenumber" name="96" href="#96">96</a>          <strong class="jxr_keyword">super</strong>(corePoolSize, maxChannelMemorySize, maxTotalMemorySize, keepAliveTime, unit);
<a class="jxr_linenumber" name="97" href="#97">97</a>      }
<a class="jxr_linenumber" name="98" href="#98">98</a>  
<a class="jxr_linenumber" name="99" href="#99">99</a>      <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="100" href="#100">100</a> <em class="jxr_javadoccomment">     * Creates a new instance.</em>
<a class="jxr_linenumber" name="101" href="#101">101</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="102" href="#102">102</a> <em class="jxr_javadoccomment">     * @param corePoolSize the maximum number of active threads</em>
<a class="jxr_linenumber" name="103" href="#103">103</a> <em class="jxr_javadoccomment">     * @param maxChannelMemorySize the maximum total size of the queued events per channel. Specify {@code 0} to</em>
<a class="jxr_linenumber" name="104" href="#104">104</a> <em class="jxr_javadoccomment">     * disable.</em>
<a class="jxr_linenumber" name="105" href="#105">105</a> <em class="jxr_javadoccomment">     * @param maxTotalMemorySize the maximum total size of the queued events for this pool Specify {@code 0} to</em>
<a class="jxr_linenumber" name="106" href="#106">106</a> <em class="jxr_javadoccomment">     * disable.</em>
<a class="jxr_linenumber" name="107" href="#107">107</a> <em class="jxr_javadoccomment">     * @param keepAliveTime the amount of time for an inactive thread to shut itself down</em>
<a class="jxr_linenumber" name="108" href="#108">108</a> <em class="jxr_javadoccomment">     * @param unit the {@link TimeUnit} of {@code keepAliveTime}</em>
<a class="jxr_linenumber" name="109" href="#109">109</a> <em class="jxr_javadoccomment">     * @param threadFactory the {@link ThreadFactory} of this pool</em>
<a class="jxr_linenumber" name="110" href="#110">110</a> <em class="jxr_javadoccomment">     * @noinspection unused</em>
<a class="jxr_linenumber" name="111" href="#111">111</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="112" href="#112">112</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../../org/jboss/netty/handler/execution/FairOrderedMemoryAwareThreadPoolExecutor.html">FairOrderedMemoryAwareThreadPoolExecutor</a>(<strong class="jxr_keyword">int</strong> corePoolSize, <strong class="jxr_keyword">long</strong> maxChannelMemorySize,
<a class="jxr_linenumber" name="113" href="#113">113</a>                                                     <strong class="jxr_keyword">long</strong> maxTotalMemorySize, <strong class="jxr_keyword">long</strong> keepAliveTime, TimeUnit unit,
<a class="jxr_linenumber" name="114" href="#114">114</a>                                                     ThreadFactory threadFactory) {
<a class="jxr_linenumber" name="115" href="#115">115</a>         <strong class="jxr_keyword">super</strong>(corePoolSize, maxChannelMemorySize, maxTotalMemorySize, keepAliveTime, unit,
<a class="jxr_linenumber" name="116" href="#116">116</a>               threadFactory);
<a class="jxr_linenumber" name="117" href="#117">117</a>     }
<a class="jxr_linenumber" name="118" href="#118">118</a> 
<a class="jxr_linenumber" name="119" href="#119">119</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="120" href="#120">120</a> <em class="jxr_javadoccomment">     * Creates a new instance.</em>
<a class="jxr_linenumber" name="121" href="#121">121</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="122" href="#122">122</a> <em class="jxr_javadoccomment">     * @param corePoolSize the maximum number of active threads</em>
<a class="jxr_linenumber" name="123" href="#123">123</a> <em class="jxr_javadoccomment">     * @param maxChannelMemorySize the maximum total size of the queued events per channel. Specify {@code 0} to</em>
<a class="jxr_linenumber" name="124" href="#124">124</a> <em class="jxr_javadoccomment">     * disable.</em>
<a class="jxr_linenumber" name="125" href="#125">125</a> <em class="jxr_javadoccomment">     * @param maxTotalMemorySize the maximum total size of the queued events for this pool Specify {@code 0} to</em>
<a class="jxr_linenumber" name="126" href="#126">126</a> <em class="jxr_javadoccomment">     * disable.</em>
<a class="jxr_linenumber" name="127" href="#127">127</a> <em class="jxr_javadoccomment">     * @param keepAliveTime the amount of time for an inactive thread to shut itself down</em>
<a class="jxr_linenumber" name="128" href="#128">128</a> <em class="jxr_javadoccomment">     * @param unit the {@link TimeUnit} of {@code keepAliveTime}</em>
<a class="jxr_linenumber" name="129" href="#129">129</a> <em class="jxr_javadoccomment">     * @param threadFactory the {@link ThreadFactory} of this pool</em>
<a class="jxr_linenumber" name="130" href="#130">130</a> <em class="jxr_javadoccomment">     * @param objectSizeEstimator the {@link ObjectSizeEstimator} of this pool</em>
<a class="jxr_linenumber" name="131" href="#131">131</a> <em class="jxr_javadoccomment">     * @noinspection unused</em>
<a class="jxr_linenumber" name="132" href="#132">132</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="133" href="#133">133</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../../org/jboss/netty/handler/execution/FairOrderedMemoryAwareThreadPoolExecutor.html">FairOrderedMemoryAwareThreadPoolExecutor</a>(<strong class="jxr_keyword">int</strong> corePoolSize, <strong class="jxr_keyword">long</strong> maxChannelMemorySize,
<a class="jxr_linenumber" name="134" href="#134">134</a>                                                     <strong class="jxr_keyword">long</strong> maxTotalMemorySize, <strong class="jxr_keyword">long</strong> keepAliveTime, TimeUnit unit,
<a class="jxr_linenumber" name="135" href="#135">135</a>                                                     <a href="../../../../../org/jboss/netty/util/ObjectSizeEstimator.html">ObjectSizeEstimator</a> objectSizeEstimator,
<a class="jxr_linenumber" name="136" href="#136">136</a>                                                     ThreadFactory threadFactory) {
<a class="jxr_linenumber" name="137" href="#137">137</a>         <strong class="jxr_keyword">super</strong>(corePoolSize, maxChannelMemorySize, maxTotalMemorySize, keepAliveTime, unit,
<a class="jxr_linenumber" name="138" href="#138">138</a>               objectSizeEstimator, threadFactory);
<a class="jxr_linenumber" name="139" href="#139">139</a>     }
<a class="jxr_linenumber" name="140" href="#140">140</a> 
<a class="jxr_linenumber" name="141" href="#141">141</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> @noinspection WeakerAccess*/</em>
<a class="jxr_linenumber" name="142" href="#142">142</a>     <strong class="jxr_keyword">protected</strong> ConcurrentMap&lt;Object, EventTask&gt; newMap() {
<a class="jxr_linenumber" name="143" href="#143">143</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> ConcurrentIdentityWeakKeyHashMap&lt;Object, EventTask&gt;();
<a class="jxr_linenumber" name="144" href="#144">144</a>     }
<a class="jxr_linenumber" name="145" href="#145">145</a> 
<a class="jxr_linenumber" name="146" href="#146">146</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="147" href="#147">147</a> <em class="jxr_javadoccomment">     * Executes the specified task concurrently while maintaining the event order.</em>
<a class="jxr_linenumber" name="148" href="#148">148</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="149" href="#149">149</a>     @Override
<a class="jxr_linenumber" name="150" href="#150">150</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> doExecute(Runnable task) {
<a class="jxr_linenumber" name="151" href="#151">151</a>         <strong class="jxr_keyword">if</strong> (task instanceof ChannelEventRunnable) {
<a class="jxr_linenumber" name="152" href="#152">152</a>             <a href="../../../../../org/jboss/netty/handler/execution/ChannelEventRunnable.html">ChannelEventRunnable</a> eventRunnable = (ChannelEventRunnable) task;
<a class="jxr_linenumber" name="153" href="#153">153</a>             <a href="../../../../../org/jboss/netty/handler/execution/FairOrderedMemoryAwareThreadPoolExecutor.html">EventTask</a> newEventTask = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/jboss/netty/handler/execution/FairOrderedMemoryAwareThreadPoolExecutor.html">EventTask</a>(eventRunnable);
<a class="jxr_linenumber" name="154" href="#154">154</a>             <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="155" href="#155">155</a> <em class="jxr_comment">              * e.g. Three event "Channel A (Event A1)","Channel A (Event A2)","Channel A (Event A3)" are</em>
<a class="jxr_linenumber" name="156" href="#156">156</a> <em class="jxr_comment">              * submitted in sequence, then key "Channel A" is refer to the value of "Event A3", and there</em>
<a class="jxr_linenumber" name="157" href="#157">157</a> <em class="jxr_comment">              * is a linked list: "Event A3" -&gt; "Event A2" -&gt; "Event A1" ( linked by the field "next" in</em>
<a class="jxr_linenumber" name="158" href="#158">158</a> <em class="jxr_comment">              * EventTask )</em>
<a class="jxr_linenumber" name="159" href="#159">159</a> <em class="jxr_comment">              */</em>
<a class="jxr_linenumber" name="160" href="#160">160</a>             Object key = getKey(eventRunnable.getEvent());
<a class="jxr_linenumber" name="161" href="#161">161</a>             <a href="../../../../../org/jboss/netty/handler/execution/FairOrderedMemoryAwareThreadPoolExecutor.html">EventTask</a> previousEventTask = map.put(key, newEventTask);
<a class="jxr_linenumber" name="162" href="#162">162</a>             <em class="jxr_comment">// Remove the entry when the channel closes.</em>
<a class="jxr_linenumber" name="163" href="#163">163</a>             removeIfClosed(eventRunnable, key);
<a class="jxr_linenumber" name="164" href="#164">164</a>             <em class="jxr_comment">// try to setup "previousEventTask -&gt; newEventTask"</em>
<a class="jxr_linenumber" name="165" href="#165">165</a>             <em class="jxr_comment">// if success, then "newEventTask" will be invoke by "previousEventTask"</em>
<a class="jxr_linenumber" name="166" href="#166">166</a>             <strong class="jxr_keyword">if</strong> (previousEventTask != <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="167" href="#167">167</a>                 <strong class="jxr_keyword">if</strong> (compareAndSetNext(previousEventTask, <strong class="jxr_keyword">null</strong>, newEventTask)) {
<a class="jxr_linenumber" name="168" href="#168">168</a>                     <strong class="jxr_keyword">return</strong>;
<a class="jxr_linenumber" name="169" href="#169">169</a>                 }
<a class="jxr_linenumber" name="170" href="#170">170</a>             }
<a class="jxr_linenumber" name="171" href="#171">171</a>             <em class="jxr_comment">// Two situation here:</em>
<a class="jxr_linenumber" name="172" href="#172">172</a>             <em class="jxr_comment">// 1. "newEventTask" is the header of linked list</em>
<a class="jxr_linenumber" name="173" href="#173">173</a>             <em class="jxr_comment">// 2. the "previousEventTask.next" is already END</em>
<a class="jxr_linenumber" name="174" href="#174">174</a>             <em class="jxr_comment">// At these two situations above, just execute "newEventTask" immediately</em>
<a class="jxr_linenumber" name="175" href="#175">175</a>             doUnorderedExecute(newEventTask);
<a class="jxr_linenumber" name="176" href="#176">176</a>         } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="177" href="#177">177</a>             doUnorderedExecute(task);
<a class="jxr_linenumber" name="178" href="#178">178</a>         }
<a class="jxr_linenumber" name="179" href="#179">179</a>     }
<a class="jxr_linenumber" name="180" href="#180">180</a> 
<a class="jxr_linenumber" name="181" href="#181">181</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> removeIfClosed(<a href="../../../../../org/jboss/netty/handler/execution/ChannelEventRunnable.html">ChannelEventRunnable</a> eventRunnable, Object key) {
<a class="jxr_linenumber" name="182" href="#182">182</a>         <a href="../../../../../org/jboss/netty/channel/ChannelEvent.html">ChannelEvent</a> event = eventRunnable.getEvent();
<a class="jxr_linenumber" name="183" href="#183">183</a>         <strong class="jxr_keyword">if</strong> (event instanceof ChannelStateEvent) {
<a class="jxr_linenumber" name="184" href="#184">184</a>             <a href="../../../../../org/jboss/netty/channel/ChannelStateEvent.html">ChannelStateEvent</a> se = (ChannelStateEvent) event;
<a class="jxr_linenumber" name="185" href="#185">185</a>             <strong class="jxr_keyword">if</strong> (se.getState() == ChannelState.OPEN &amp;&amp; !event.getChannel().isOpen()) {
<a class="jxr_linenumber" name="186" href="#186">186</a>                 removeKey(key);
<a class="jxr_linenumber" name="187" href="#187">187</a>             }
<a class="jxr_linenumber" name="188" href="#188">188</a>         }
<a class="jxr_linenumber" name="189" href="#189">189</a>     }
<a class="jxr_linenumber" name="190" href="#190">190</a> 
<a class="jxr_linenumber" name="191" href="#191">191</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="192" href="#192">192</a> <em class="jxr_javadoccomment">     * call removeKey(Object key) when the life cycle of the key ends, such as when the channel is closed</em>
<a class="jxr_linenumber" name="193" href="#193">193</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="194" href="#194">194</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">boolean</strong> removeKey(Object key) {
<a class="jxr_linenumber" name="195" href="#195">195</a>         <strong class="jxr_keyword">return</strong> map.remove(key) != <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="196" href="#196">196</a>     }
<a class="jxr_linenumber" name="197" href="#197">197</a> 
<a class="jxr_linenumber" name="198" href="#198">198</a>     <strong class="jxr_keyword">protected</strong> Object getKey(<a href="../../../../../org/jboss/netty/channel/ChannelEvent.html">ChannelEvent</a> e) {
<a class="jxr_linenumber" name="199" href="#199">199</a>         <strong class="jxr_keyword">return</strong> e.getChannel();
<a class="jxr_linenumber" name="200" href="#200">200</a>     }
<a class="jxr_linenumber" name="201" href="#201">201</a> 
<a class="jxr_linenumber" name="202" href="#202">202</a>     @Override
<a class="jxr_linenumber" name="203" href="#203">203</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">boolean</strong> shouldCount(Runnable task) {
<a class="jxr_linenumber" name="204" href="#204">204</a>         <strong class="jxr_keyword">return</strong> !(task instanceof <a href="../../../../../org/jboss/netty/handler/execution/FairOrderedMemoryAwareThreadPoolExecutor.html">EventTask</a>) &amp;&amp; <strong class="jxr_keyword">super</strong>.shouldCount(task);
<a class="jxr_linenumber" name="205" href="#205">205</a>     }
<a class="jxr_linenumber" name="206" href="#206">206</a> 
<a class="jxr_linenumber" name="207" href="#207">207</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">boolean</strong> compareAndSetNext(<a href="../../../../../org/jboss/netty/handler/execution/FairOrderedMemoryAwareThreadPoolExecutor.html">EventTask</a> eventTask, <a href="../../../../../org/jboss/netty/handler/execution/FairOrderedMemoryAwareThreadPoolExecutor.html">EventTask</a> expect, <a href="../../../../../org/jboss/netty/handler/execution/FairOrderedMemoryAwareThreadPoolExecutor.html">EventTask</a> update) {
<a class="jxr_linenumber" name="208" href="#208">208</a>         <em class="jxr_comment">// because the "next" field is modified by method "doExecute()" and</em>
<a class="jxr_linenumber" name="209" href="#209">209</a>         <em class="jxr_comment">// method "EventTask.run()", so use CAS for thread-safe</em>
<a class="jxr_linenumber" name="210" href="#210">210</a>         <strong class="jxr_keyword">return</strong> fieldUpdater.compareAndSet(eventTask, expect, update);
<a class="jxr_linenumber" name="211" href="#211">211</a>     }
<a class="jxr_linenumber" name="212" href="#212">212</a> 
<a class="jxr_linenumber" name="213" href="#213">213</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/jboss/netty/handler/execution/FairOrderedMemoryAwareThreadPoolExecutor.html">EventTask</a> <strong class="jxr_keyword">implements</strong> Runnable {
<a class="jxr_linenumber" name="214" href="#214">214</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> @noinspection unused*/</em>
<a class="jxr_linenumber" name="215" href="#215">215</a>         <strong class="jxr_keyword">volatile</strong> <a href="../../../../../org/jboss/netty/handler/execution/FairOrderedMemoryAwareThreadPoolExecutor.html">EventTask</a> next;
<a class="jxr_linenumber" name="216" href="#216">216</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../../org/jboss/netty/handler/execution/ChannelEventRunnable.html">ChannelEventRunnable</a> runnable;
<a class="jxr_linenumber" name="217" href="#217">217</a> 
<a class="jxr_linenumber" name="218" href="#218">218</a>         <a href="../../../../../org/jboss/netty/handler/execution/FairOrderedMemoryAwareThreadPoolExecutor.html">EventTask</a>(<a href="../../../../../org/jboss/netty/handler/execution/ChannelEventRunnable.html">ChannelEventRunnable</a> runnable) {
<a class="jxr_linenumber" name="219" href="#219">219</a>             <strong class="jxr_keyword">this</strong>.runnable = runnable;
<a class="jxr_linenumber" name="220" href="#220">220</a>         }
<a class="jxr_linenumber" name="221" href="#221">221</a> 
<a class="jxr_linenumber" name="222" href="#222">222</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> run() {
<a class="jxr_linenumber" name="223" href="#223">223</a>             <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="224" href="#224">224</a>                 runnable.run();
<a class="jxr_linenumber" name="225" href="#225">225</a>             } <strong class="jxr_keyword">finally</strong> {
<a class="jxr_linenumber" name="226" href="#226">226</a>                 <em class="jxr_comment">// if "next" is not null, then trigger "next" to execute;</em>
<a class="jxr_linenumber" name="227" href="#227">227</a>                 <em class="jxr_comment">// else if "next" is null, set "next" to END, means end this linked list</em>
<a class="jxr_linenumber" name="228" href="#228">228</a>                 <strong class="jxr_keyword">if</strong> (!compareAndSetNext(<strong class="jxr_keyword">this</strong>, <strong class="jxr_keyword">null</strong>, end)) {
<a class="jxr_linenumber" name="229" href="#229">229</a>                     doUnorderedExecute(next);
<a class="jxr_linenumber" name="230" href="#230">230</a>                 }
<a class="jxr_linenumber" name="231" href="#231">231</a>             }
<a class="jxr_linenumber" name="232" href="#232">232</a>         }
<a class="jxr_linenumber" name="233" href="#233">233</a>     }
<a class="jxr_linenumber" name="234" href="#234">234</a> }
</pre>
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